From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f80.google.com (mail-oo1-f80.google.com [209.85.161.80]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E1FC4338592 for ; Tue, 7 Apr 2026 20:35:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775594131; cv=none; b=crmlmjAxbzlB0d+ESv7UdAVAlWVUTsYjivOSFR2R2DKkEew7/WGpPsny68KRQeh5uZ+1zo9tq6qSAbWBrYRIAzFSuSwRNyMYkpMZPznSfOXA9hAMF9ONJInkCuI9d+kzN2KUOBCgaXSg6aU/7+WJ6ovcP7sFk2wEjSDr969rNzg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775594131; c=relaxed/simple; bh=UJQ8tTGwe60L4fGtTfOqmrArLKsfe5i/rLB7iDn6LpE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=e+txec3JlIvKPDGhSZrcHSwetHFha4GkR7WgTAiOGrOrGvEr8uW59KFFsM+9KmeDbUjP4GMvP5c3bLp/mqKnIVR/ExIjc2Sezmz/XL/HghNCKSr94VfS1lnlaOr60jkgxqxtShuJv0iCcTIBUKrqVk1RAzbmSKlFKXKSlj6l2yE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.161.80 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo1-f80.google.com with SMTP id 006d021491bc7-67df63d61e0so15024025eaf.2 for ; Tue, 07 Apr 2026 13:35:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1775594129; x=1776198929; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=5KfmEpOYEOSlgLhRYLojn6YVk+Z22HFOwx4QJusbr5w=; b=rvT+woQ6f73V4Tp2RMqyNQqdwq64fUoLZhTa3e+AmNb3PY1hFaYAxstfhZjrm4w/Kj FnnnvZDKwfE3U+DvHZNKLC++W4XHtvT4zNxMaPCNwJkyBzRd7jpvTD3n28fcYXSY9XiX 7BxYN+u7/6KyIPutaVybmrDENum8hnlZS3/64SqDNwiGlP3xGGL7uA8qKZhs2OLMuJJh rSeRNYU2BUP6h4SodEergK9KfsSqJf/vWB/FTKBLrjgYY52hXCs8WzQAJeQn1hkuRp0z 1nufaFtzkSNiVmWyievmrKULOsl+AlCltxZz4rmP4G64fDp/4znvfT2HVnnSv9e3W7Pd DLJg== X-Gm-Message-State: AOJu0YzZUkP+j3RuBgGrpjiUROGW44uQ/2Ee6kLXsTlq72pWbviNtl07 ghQdEMUFl0kQzT4nYt95goJM5v0V+g+fikSrkGbz4bDs3fuC2T2lopGT2FUNW2WnI+1QLvKESw4 6FgEKegIOL3PdctMChVtyrphOmBurOQRH1C1N514oXc1K58Mr1Kr+4FZLE2pE7Q== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2f0d:b0:688:b145:46cb with SMTP id 006d021491bc7-688b14547d6mr951683eaf.32.1775594128990; Tue, 07 Apr 2026 13:35:28 -0700 (PDT) Date: Tue, 07 Apr 2026 13:35:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69d56a90.050a0220.28fc4.0002.GAE@google.com> Subject: [syzbot] [media?] general protection fault in em28xx_resolution_set (2) From: syzbot To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-usb@vger.kernel.org, mchehab@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 81ebd43cc0d6 usb: gadget: f_hid: don't call cdev_init whil.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=140d45ca580000 kernel config: https://syzkaller.appspot.com/x/.config?x=36a2baf561dcdf64 dashboard link: https://syzkaller.appspot.com/bug?extid=755151a86449f029bae0 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/59aca7fb2d65/disk-81ebd43c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/87180154ea1a/vmlinux-81ebd43c.xz kernel image: https://storage.googleapis.com/syzbot-assets/862a7fc58ad2/bzImage-81ebd43c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+755151a86449f029bae0@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000354: 0000 [#1] SMP KASAN PTI KASAN: probably user-memory-access in range [0x0000000000001aa0-0x0000000000001aa7] CPU: 0 UID: 0 PID: 5637 Comm: v4l_id Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:norm_maxh drivers/media/usb/em28xx/em28xx-video.c:149 [inline] RIP: 0010:em28xx_resolution_set.isra.0+0xe4/0x730 drivers/media/usb/em28xx/em28xx-video.c:317 Code: 0f 85 d5 05 00 00 48 8d bd a0 1a 00 00 44 0f b6 bb 3c 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 41 83 e7 10 <80> 3c 02 00 0f 85 e9 05 00 00 31 ff 44 89 fe 4c 8b a5 a0 1a 00 00 RSP: 0018:ffffc90002027798 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88811f368000 RCX: ffffffff85a50292 RDX: 0000000000000354 RSI: ffffffff85a4f799 RDI: 0000000000001aa0 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88812bc88000 R13: 1ffff92000404ef7 R14: ffff88811f36813c R15: 0000000000000000 FS: 00007f8c837eb880(0000) GS:ffff8882686f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8c839e455a CR3: 000000010735c000 CR4: 00000000003506f0 Call Trace: em28xx_v4l2_open+0x457/0x570 drivers/media/usb/em28xx/em28xx-video.c:2166 v4l2_open+0x1d2/0x490 drivers/media/v4l2-core/v4l2-dev.c:433 chrdev_open+0x234/0x6a0 fs/char_dev.c:411 do_dentry_open+0x68b/0x14b0 fs/open.c:949 vfs_open+0x82/0x3f0 fs/open.c:1081 do_open fs/namei.c:4671 [inline] path_openat+0x208c/0x31a0 fs/namei.c:4830 do_file_open+0x20e/0x430 fs/namei.c:4859 do_sys_openat2+0x10d/0x1e0 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x12d/0x210 fs/open.c:1383 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0x7b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8c838d9407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffe5cd9fa90 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8c837eb880 RCX: 00007f8c838d9407 RDX: 0000000000000000 RSI: 00007ffe5cda0f21 RDI: ffffffffffffff9c RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffe5cd9fce0 R14: 00007f8c8406f000 R15: 0000555f3c43e4d8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:norm_maxh drivers/media/usb/em28xx/em28xx-video.c:149 [inline] RIP: 0010:em28xx_resolution_set.isra.0+0xe4/0x730 drivers/media/usb/em28xx/em28xx-video.c:317 Code: 0f 85 d5 05 00 00 48 8d bd a0 1a 00 00 44 0f b6 bb 3c 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 41 83 e7 10 <80> 3c 02 00 0f 85 e9 05 00 00 31 ff 44 89 fe 4c 8b a5 a0 1a 00 00 RSP: 0018:ffffc90002027798 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88811f368000 RCX: ffffffff85a50292 RDX: 0000000000000354 RSI: ffffffff85a4f799 RDI: 0000000000001aa0 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000002 ---------------- Code disassembly (best guess): 0: 0f 85 d5 05 00 00 jne 0x5db 6: 48 8d bd a0 1a 00 00 lea 0x1aa0(%rbp),%rdi d: 44 0f b6 bb 3c 01 00 movzbl 0x13c(%rbx),%r15d 14: 00 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 89 fa mov %rdi,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx 26: 41 83 e7 10 and $0x10,%r15d * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 e9 05 00 00 jne 0x61d 34: 31 ff xor %edi,%edi 36: 44 89 fe mov %r15d,%esi 39: 4c 8b a5 a0 1a 00 00 mov 0x1aa0(%rbp),%r12 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup